Homeowners Insurance Replacement Cost Calculator

Replacement Cost vs Market Value vs Assessment

Three different numbers, three different uses. Replacement cost is the price to rebuild your home as-is with current materials and labor — what your insurance must cover. Market value is what a buyer would pay today for the home AND the land — drops can happen even when replacement cost rises. Tax assessment is the county's value for property tax — usually 60-80% of market value due to assessment limits.

Insurance must use replacement cost, not the other two. A $400,000 market-value home on a $150,000 lot might have only $250,000 in replacement cost. Conversely, a $400,000 market-value home on a $50,000 lot in a soft market might have $350,000+ in replacement cost. Source: National Association of Insurance Commissioners (naic.org). Last updated: May 2026.

Why Underinsurance Is the #1 Homeowner Mistake

Most policies include a coinsurance clause requiring you to insure at least 80% of replacement cost. If you're below that threshold and have a partial loss, your claim payment is reduced proportionally — even if the loss is within your policy limit. Example: $300,000 replacement cost home insured for $200,000 (67% of RC, below the 80% threshold). A $50,000 fire claim pays only ($200K ÷ $240K) × $50K = $41,667 minus deductible. You eat the difference.

Regional Cost Variations in 2026

Construction costs vary 30-50% across US regions. Hawaii and Alaska are highest ($270+/sq ft baseline) due to shipping costs. West Coast and Northeast run $190-$215/sq ft for standard construction. Midwest and South are $145-$170/sq ft. Inflation-Guard endorsements automatically increase Coverage A each renewal by 4-6% — essential in fast-rising markets but still requires periodic recalculation.

Extended and Guaranteed Replacement Cost Endorsements

Two upgrades worth the small premium: Extended Replacement Cost (ERC) adds 25-50% above Coverage A automatically — covers cost overruns after total losses (common during regional disasters when contractor demand spikes). Guaranteed Replacement Cost (GRC) covers full rebuild regardless of policy limit — gold standard but only available from carriers like Chubb, USAA, AAA. Both endorsements add about 2-5% to the annual premium and can save you tens of thousands after a total loss.